21510242662 has 4 divisors (see below), whose sum is σ = 32265363996. Its totient is φ = 10755121330.

The previous prime is 21510242657. The next prime is 21510242671. The reversal of 21510242662 is 26624201512.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5377560664 + ... + 5377560667.

It is an arithmetic number, because the mean of its divisors is an integer number (8066340999).

Almost surely, 2^21510242662 is an apocalyptic number.

21510242662 is a deficient number, since it is larger than the sum of its proper divisors (10755121334).

21510242662 is a wasteful number, since it uses less digits than its factorization.

21510242662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10755121333.

The product of its (nonzero) digits is 11520, while the sum is 31.

The spelling of 21510242662 in words is "twenty-one billion, five hundred ten million, two hundred forty-two thousand, six hundred sixty-two".